Development of the NS Flashcards

1
Q

during brain development how many neurons are added every minute

A

250,000

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2
Q

at birth how may neuros are present

A

almost all the neurons that the brain will ever have

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3
Q

when does the brain grow

A

continues to grow for a few years after birth

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4
Q

when is the brain 80% of the adult size

A

age 2

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5
Q

what do glia do

A

continue to divide and multiply

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6
Q

1st indication of the future nervous system

A

neuroectoderm

contains the neural plate

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7
Q

when does neuroectoderm occur

A

16th day after fertilization

week 3

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8
Q

where does the neural plate appear

A

dorsal midline of the embryo

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9
Q

what do the cells of the neuro plate do

A

become taller than those of the ordinary ectoderm

–> underlying mesodermal cells

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10
Q

how do the cells of the neural plate grow

A

rapidly

–> in 2 days becomes a neural groove with a nerual fold along each side

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11
Q

what do the neural fold and groove give rise to

A

neural tube

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12
Q

development of neural tube

A

neural plate –> neural groove –> neural tube

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13
Q

process of the development of the neural tube

A

neurulation

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14
Q

where does the closure of the neural groove occur

A

midcervical level

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15
Q

where does the closure of the neural groove continue

A

caudal and cranial directions

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16
Q

when does the neural tube form

A

3rd week

stage 10

17
Q

what is the neural tube the forerunner of

A

brain and spinal cord rostrally and caudally

18
Q

neuropores –> neural tube

A

rostral and caudal

19
Q

rostral neuropores

A

close at day 25

20
Q

failure of rostral neuropore closure

A

anencephaly

21
Q

caudal neuropores

A

close at day 27

22
Q

failure of caudal neuropores to close

A

spina bifida

23
Q

neuro-epithelium –> neural tube

A

cells lining the tube from which neurons and other cells arise

24
Q

neural crest

A

neuroectodermal cells that are not incorporated in the tube

nonneural cells (neuroglia) of peripheral nerves

25
Q

where is the neural crest

A

dorsal root ganglia of spinal nerves

26
Q

example of a nonneural cell (neuroglia)

A

schwann cell

27
Q

placodes

A

thickened regions of the ectoderm of the head’s structure

28
Q

what do placodes do

A

give rise to some peripheral nervous elements –> sense organs